This arrow fish bone style posture correction strap is designed specifically to improve hunchback and protect upright posture, making it a great helper for adults and children to correct their posture. It is made of a combination of velvet, high-density sponge, and nylon webbing materials: velvet is skin friendly and soft, fitting the skin without friction or discomfort; High density sponge provides sufficient support and can gently assist in keeping the back straight; Nylon webbing is tough and durable, not easily deformed or broken when worn, and provides long-lasting assistance in correcting body posture. The product offers multiple sizes including S, M, L, and XL to meet the needs of different body types. Lightweight individual weight (S size 70g, M size 80g, L size 100g, XL size 105g), no heavy burden even when worn for a long time; The packaging size is exquisite, with S and M sizes of 14202.5CM and L and XL sizes of 17253CM. It is easy to store and carry, and can be easily used for home, office, and study. The unique arrow fish bone design can better fit the curve of the back, accurately assist in correcting hunchback, help develop good posture habits, and keep you confident and upright at all times, bidding farewell to hunchback troubles.